Here's a story about this stuff. Down a few paragraphs it says "And there won't be another for more than a hundred years. The next noteworthy numerological palindrome, as it were, swings round at 9:21 p.m. on the 21st day of December in the year 2112. Unless our descendants have figured out an entirely new method of numerical notation, they'll mark that moment as 2112 2112 2112."